Abstract

Based on a specially created theoretical model, frequency dependences of the luminescence intensity of the two-component “exciton-activated semiconductor quantum dot (QD)–plasmon nanoparticle (NP)” system in a constant magnetic field are calculated. In contrast to previous models, it goes beyond the scope of the approximation of dipole polarizability of a spherical NP. The induced NP dipole moment was calculated taking into account the inhomogeneous character of the field created by the QD containing an exciton. It is shown that, with a change in induction of the external magnetic field, one can observe transformation of exciton luminescence spectra of such system as a result of the exciton–plasmon interaction between cluster particles and magnetization of the NP electron plasma. The competition of radiative and nonradiative decay channels of the excited state of a two-particle complex is taken into account. It is shown that, in rate spectra of the nonradiative energy transfer from the QD to the NP, as well as of spontaneous emission of the nanocomplex, stripes of higher order multipole transitions are formed in addition to dipole stripes; they are split into doublet components in the magnetic field.

中文翻译：

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球形量子点和等离子体纳米球在外部磁场中的两粒子复合物的发光。

摘要

基于专门创建的理论模型，计算了在恒定磁场中两组分“激子激活的半导体量子点（QD）-等离子体纳米粒子（NP）”系统的发光强度与频率的关系。与以前的模型相比，它超出了球形NP偶极子极化率的近似范围。考虑到包含激子的QD产生的磁场的不均匀特性，计算出感应的NP偶极矩。结果表明，随着外部磁场感应的变化，由于团簇粒子之间的激子-等离子体激元相互作用和NP电子等离子体的磁化，人们可以观察到这种系统的激子发光光谱的转变。考虑了两粒子复合物激发态的辐射衰变通道和非辐射衰变通道之间的竞争。结果表明，在从QD到NP的非辐射能量转移以及纳米复合物的自发发射的速率谱中，除了偶极子条纹外，还形成了更高阶的多极跃迁条纹。它们在磁场中分裂为双峰分量。